(19)

(11)

EP 2 591 310 A1

(12)

(43) Date of publication: 15.05.2013 Bulletin 2013/20 (21) Application number: 11745562.6 (22) Date of filing: 05.07.2011

(51) International Patent Classification (IPC):  G01B 21/04(2006.01) (86) International application number: PCT/GB2011/001012 (87) International publication number: WO 2012/004555 (12.01.2012 Gazette 2012/02)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 20.08.2010 GB 201013938 07.07.2010 US 362067 P (71) Applicant: Renishaw plc Gloucestershire GL12 8JR (GB)	(72) Inventor: SOMERVILLE, Leo, Christopher St Charles Illinois 60174 (US) (74) Representative: Dunn, Paul Edward  Renishaw plc Patent Department New Mills Wotton-under-Edge, Glos. GL12 8JR Wotton-under-Edge, Glos. GL12 8JR (GB)